Parity Forwarding for Relay Networks

Speaker: Peyman Razaghi,
Ph.D. candidate at University of TorontoAbstract: A relay is an intermediate communication device to assist the communication between a source node and a destination node. In this talk, we introduce a relaying strategy for multiple-relay networks called parity forwarding. We begin with the classic single-relay channel and develop a coding structure called bilayer LDPC coding to implement the bin-and-forward scheme of the classic decode-and-forward (DF) method. For DF, it is shown that binning is equivalent to generating parities, hence the name parity forwarding is suggested. For a multiple-relay channel with a single source and a single destination, we introduce a class of parity forwarding protocols in which relays send parity messages for the source message or the messages of other relays. We show that the proposed parity forwarding scheme improves the achievable DF rate and is capacity achieving for new types of degraded multiple-relay networks and improves previous achievable DF rates. Finally, we consider a network consisting of two interfering senders, two destinations, and a single relay. For additive channels, we show that in the asymptotic case where the receiver noise is negligible as compared to interference, a binning strategy which does not require decoding at the relay is asymptotically optimal.Biography: Peyman Razaghi has received his B.Sc. (2002) and M.Sc. (2004) degrees in Electrical Engineering from Sharif University of Technology. He is currently a Ph.D. candidate in the Department of Electrical and Computer Engineering at the University of Toronto, working with Prof. Wei Yu in the Communication Algorithms Laboratory. His research interests include multiuser information theory, modern coding, and wireless communications. He is a recipient of the Ontario Graduate Student Scholarship, and is a member of the Iranian National Organization for Development of Exceptional Talents (NODET).Host: Giuseppe Caire, caire@usc.edu, EEB 528, x04683

Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248

Audiences: Everyone Is Invited

Contact: Gerrielyn Ramos